(0853) Complementאֵת'eth{ayth}Apparently contracted from H0226 in the demonstrative sense of entity; properly self (but generally used to point out more definitely the object of a verb or preposition, even or namely).

{7725} Primeשׁוּבshuwb{shoob}A primitive root; to turn back (hence, away) transitively or intransitively, literally or figuratively (not necessarily with the idea of return to the starting point); generally to retreat; often adverbially again.

{3027} Primeיָדyad{yawd}A primitive word; a hand (the open one (indicating power, means, direction, etc.), in distinction from H3709, the closed one); used (as noun, adverb, etc.) in a great variety of applications, both literally and figuratively, both proximate and remote.

Isaiah 9:12

_ _ Syrians  Though now allies of Ephraim, after Rezin’s death they shall join the Assyrians against Ephraim. “Together,” in Isaiah 9:11, refers to this. Conquering nations often enlist in their armies the subject races (Isaiah 22:6; compare 2 Kings 16:9; Jeremiah 35:11), [Aben Ezra, Gesenius]. Horsley less probably takes “Syrians before,” as the Syrians to the east, that is, not Rezin’s subjects, but the Assyrians: “Aram” being the common name of Syrians and Assyrians.

_ _ Philistines  of Palestine.

_ _ behind  from the west: in marking the points of the compass, Orientalists face the east, which is before them: the west is behind. The right hand is the south: the left, the north.

Isaiah 9:12

Syrians  For though Rezin, king of Syria was destroyed, yet the body of the nation survived, and submitted themselves to the king of Assyria, and upon his command invaded Israel afterwards. Before  Heb. on the east: for Syria stood eastward from Israel. Behind  On the western side of the land of Israel. Devour  Like wild beasts.

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Syrians:

2 Kings 16:6 At that time Rezin king of Syria recoveredElath to Syria, and drave the Jews from Elath: and the Syrians came to Elath, and dwelt there unto this day.2 Chronicles 28:18 The Philistines also had invaded the cities of the low country, and of the south of Judah, and had taken Bethshemesh, and Ajalon, and Gederoth, and Shocho with the villages thereof, and Timnah with the villages thereof, Gimzo also and the villages thereof: and they dwelt there.Jeremiah 35:11 But it came to pass, when Nebuchadrezzar king of Babylon came up into the land, that we said, Come, and let us go to Jerusalem for fear of the army of the Chaldeans, and for fear of the army of the Syrians: so we dwell at Jerusalem.

devour Israel:

Deuteronomy 31:17 Then my anger shall be kindled against them in that day, and I will forsake them, and I will hide my face from them, and they shall be devoured, and many evils and troubles shall befall them; so that they will say in that day, Are not these evils come upon us, because our God [is] not among us?Psalms 79:7For they have devoured Jacob, and laid waste his dwelling place.Psalms 129:3-6The plowers plowed upon my back: they made long their furrows. ... Let them be as the grass [upon] the housetops, which withereth afore it groweth up:Jeremiah 10:25Pour out thy fury upon the heathen that know thee not, and upon the families that call not on thy name: for they have eaten up Jacob, and devoured him, and consumed him, and have made his habitation desolate.

open mouth:

Heb. whole mouth

For all:

Isaiah 9:17 Therefore the Lord shall have no joy in their young men, neither shall have mercy on their fatherless and widows: for every one [is] an hypocrite and an evildoer, and every mouth speaketh folly. For all this his anger is not turned away, but his hand [is] stretched out still.Isaiah 9:21 Manasseh, Ephraim; and Ephraim, Manasseh: [and] they together [shall be] against Judah. For all this his anger is not turned away, but his hand [is] stretched out still.Isaiah 5:25 Therefore is the anger of the LORD kindled against his people, and he hath stretched forth his hand against them, and hath smitten them: and the hills did tremble, and their carcases [were] torn in the midst of the streets. For all this his anger is not turned away, but his hand [is] stretched out still.Isaiah 10:4Without me they shall bow down under the prisoners, and they shall fall under the slain. For all this his anger is not turned away, but his hand [is] stretched out still.Jeremiah 4:8 For this gird you with sackcloth, lament and howl: for the fierce anger of the LORD is not turned back from us.